[PATCH 2/2] staging: r8188eu: replace FIELD_OFFSET with offsetof

[Nam Cao]

This driver defines FIELD_OFFSET which does the same as offsetof.
Replace this macro with offsetof.

Signed-off-by: Nam Cao <namcaov@xxxxxxxxx>
---
 drivers/staging/r8188eu/core/rtw_mlme_ext.c   | 4 ++--
 drivers/staging/r8188eu/include/basic_types.h | 2 --
 drivers/staging/r8188eu/os_dep/ioctl_linux.c  | 4 ++--
 3 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/staging/r8188eu/core/rtw_mlme_ext.c b/drivers/staging/r8188eu/core/rtw_mlme_ext.c
index 87bf37f33606..2be166abe99c 100644
--- a/drivers/staging/r8188eu/core/rtw_mlme_ext.c
+++ b/drivers/staging/r8188eu/core/rtw_mlme_ext.c
@@ -7072,7 +7072,7 @@ u8 createbss_hdl(struct adapter *padapter, u8 *pbuf)
 		/* clear CAM */
 		flush_all_cam_entry(padapter);
 
-		memcpy(pnetwork, pbuf, FIELD_OFFSET(struct wlan_bssid_ex, IELength));
+		memcpy(pnetwork, pbuf, offsetof(struct wlan_bssid_ex, IELength));
 		pnetwork->IELength = ((struct wlan_bssid_ex *)pbuf)->IELength;
 
 		if (pnetwork->IELength > MAX_IE_SZ)/* Check pbuf->IELength */
@@ -7129,7 +7129,7 @@ u8 join_cmd_hdl(struct adapter *padapter, u8 *pbuf)
 	pmlmeinfo->candidate_tid_bitmap = 0;
 	pmlmeinfo->bwmode_updated = false;
 
-	memcpy(pnetwork, pbuf, FIELD_OFFSET(struct wlan_bssid_ex, IELength));
+	memcpy(pnetwork, pbuf, offsetof(struct wlan_bssid_ex, IELength));
 	pnetwork->IELength = ((struct wlan_bssid_ex *)pbuf)->IELength;
 
 	if (pnetwork->IELength > MAX_IE_SZ)/* Check pbuf->IELength */
diff --git a/drivers/staging/r8188eu/include/basic_types.h b/drivers/staging/r8188eu/include/basic_types.h
index c4b08fb82200..0b71e2c6e41a 100644
--- a/drivers/staging/r8188eu/include/basic_types.h
+++ b/drivers/staging/r8188eu/include/basic_types.h
@@ -9,8 +9,6 @@
 
 typedef void (*proc_t)(void *);
 
-#define FIELD_OFFSET(s, field)	((ssize_t)&((s *)(0))->field)
-
 /* port from fw */
 /*  TODO: Macros Below are Sync from SD7-Driver. It is necessary
  * to check correctness */
diff --git a/drivers/staging/r8188eu/os_dep/ioctl_linux.c b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
index 1b09462ca908..2063ace8398f 100644
--- a/drivers/staging/r8188eu/os_dep/ioctl_linux.c
+++ b/drivers/staging/r8188eu/os_dep/ioctl_linux.c
@@ -403,7 +403,7 @@ static int wpa_set_encryption(struct net_device *dev, struct ieee_param *param,
 
 		if (wep_key_len > 0) {
 			wep_key_len = wep_key_len <= 5 ? 5 : 13;
-			wep_total_len = wep_key_len + FIELD_OFFSET(struct ndis_802_11_wep, KeyMaterial);
+			wep_total_len = wep_key_len + offsetof(struct ndis_802_11_wep, KeyMaterial);
 			pwep = kzalloc(wep_total_len, GFP_KERNEL);
 			if (!pwep)
 				goto exit;
@@ -1593,7 +1593,7 @@ static int rtw_wx_set_enc(struct net_device *dev,
 	if (erq->length > 0) {
 		wep.KeyLength = erq->length <= 5 ? 5 : 13;
 
-		wep.Length = wep.KeyLength + FIELD_OFFSET(struct ndis_802_11_wep, KeyMaterial);
+		wep.Length = wep.KeyLength + offsetof(struct ndis_802_11_wep, KeyMaterial);
 	} else {
 		wep.KeyLength = 0;
 
-- 
2.25.1